Diamond-polishing tool



3 Sheets-Sheet 1.

(No Model.)

B. 9 R LOE SSER. DIAMOND POLISHING T001 Patente Apr. 21, 1896.

ATTO A/HS AN DREW BLRANAM PHUTO IJTHQWASMI NGTDN D C (No Model.) I, 3 SheetsSheet 2. E. 8v R. LOESSER. DIAMOND POLISHING TOOL.

Patented A r. 21, 1896.

ATTORNEYS AN DREW BJZRANAM. PNOTO-LITKO.WASHYNGTUN. D C

(R0 Model.) 3 Sheets-Sheet 3. E. 82: R. LOESSER. DIAMOND POLISHING TOOL.

ATTORNEYS ANDREW EGRAHAM PHOTD-LITNO. WASHINGTON. DC

NlTE STATES 1 ATENT OFFICE...

ERNEST LOESSER AND RICHARD LOESSER, OF BROOKLYN, NEW YORK.

DIAMOND-POLISHING TOOL.

SPECIFICATION forming part of Letters Patent No. 558,909, dated April 21, 1896.

Application filed August 13, 1895.

To all whom it may concern:

Be it known that we, ERNEST Lonssnn and RICHARD Lonssnn, citizens of the United States, residing in Brooklyn, in the county of Kings and State of New York, have invented certain new and useful Improvements in Diamond-Polishing Tools, of which the following is a specification.

This invention has reference to certain improvements over the invention covered by our application filed July 1, 1895, Serial No. 554,537. 7

The object of the present invention is to provide a safe and accurate adjustment of the three positions of the diamond or other gem to be cutnamely, that position for obtaining the precise inclination of the facets, that for obtaining the proper position of the diamond, as respects the grain, with relation to the rotating polishing-wheel, and that position which depends on the manner of facets to be polished off.

A further object is to provide an automatic stop mechanism which is so set that it is brought into play at the moment that the polishin g of a facet has been completed, with the effect that the tongue or arm of the tool is raised and the diamond lifted away from the polishing-wheel.

To these ends our invention consists of a bed-piece or base provided with a horizontally-projecting arm or tongue, a head-plate at the outer end of the arm or tongue pro vided with a circular opening, a rotary table or ring mounted so as to turn in said opening, means for guiding and retaining the table in the opening, a vertically-adjustable post guided in an opening in the table or ring, an arc-shaped or segmental guide-piece fixed" to the lower end of the post, and a dop provided with means for guiding and for adj ustably securing it in proper position on the areshaped guidepiece, and means for axially adjusting the socket-piece of the dop within the chuck; and the invention further consists of the automatic stop and lifting mechanism constructed, combined, and operated as will be hereinafter described, and all of which parts will be specified and defined in the claims.

In the accompanying drawings, Figure 1 is a side elevation of our improved dia1nondl the opening of the table D is accomplished by meansof an adjustingscrew g, which $eria1No. 559,157, (No model.)

polishing tool, showing the stop mechanism in dotted lines. Fig. 2 is a plan view of the tool. Fig. 3 is a vertical section on the line 3 3, Fig. 2. Fig. 4 is a detail view of the setting wheel or cylinder for determining the number of facets to be produced or polished off; and Figs. 5 and 6 are respectively a plan view and a longitudinal section on the line 6 6, Fig. 5, of the automatic stop and. lifting m echanism.

Similar letters of reference indicate correspondin g parts.

Referring to the drawings, A indicates the bed-piece or base of the tool, from which proj ects a horizontal arm or tongue B, consisting of a bar fastened by screws or other means I) to the top part of the bed-piece, said arm having at its outer end a circular head-plate 13, provided with a circular opening 0,- from which radiates a slit b which extends longitudinally of the arm or tongue. The headplate 13 of the arm B is provided with an aunular groove C for receiving an annular flange d, which is formed on the exterior of a circular rotary table or ring D, which turns in the opening in the head-plate, said rotary table resting upon a fiat supporting-ring c, that projects under the same and is secured to the lower part of the head-plate B by means of suitable fastenings e. A vertical guidegroove d is formed in the inner wall of the central opening of the rotary table or ring D and receives a feather or lateral projection f, which extends from one side of a post F,

that is by means of said feather f and the groove (1 guided vertically in the axial opening in the table D, but cannot turn. The ilgitudinal movement of the post F within screws-into a screw-threaded hole in the rotary table D and passes through an opening in a ring g, which is secured by means of a set-screw g or other suitable means to the upper part of the post. After the vertical adjustment of the post F has been accomplished the same is set by means of a settingscrew 9 which passes through the opposite side of the ring 9 and bears by its lower end upon the top of the table I).

To the foot part F of the post F is secured an arc-shaped or segmental guide-piece H,

which consists of two longitudinally-divided sections h h, which are secured to the foot part F of the post by means of suitable fastenings 77, said sections h 77. being so constructed and grooved as that the are-shaped guide-piece is provided with a guideway 7L3, which is of T shape in cross-section. This arc-shaped guide-piece II is secured to the foot part ofthe post near one end, as shown; but, if desired, it may extend for equal length on either side of the post, in which case the right-hand end would be formed exactly the same as the left-hand end. A hollow chuck I is provided with a headed shank 2', which is guided in the guideway lbs of the arc-shaped guide-piece, said headed shank having a laterally-extended screw-threaded pin 1, which passes through a side slot 71*, formed in one side of the arc-shaped guide-piece, and onto the screw-threaded portion of which is screwed a binding-nut J.

The diamond X to be polished is cemented or soldered into the cavity of a socket-piece K, which is provided with an axial screwthreaded stem 7c, that is screwed into an axial opening in the recessed setting wheel or cylinder L, said setting-wheel being retained in the chuck I of the dop by means of a setserew m, which passes through a side opening m in the chuck part I and engages byits inner end in either one of the upper series of holes or sockets Z, formed at the upper part of the setting-wheel. As in our previous invention, the outer surface of the settingwheel L is provided with three series of holes or sockctsnamely, Z, Z, and P-the sockets or holes Z Z being arranged exactly the same and in vertical alinementthat is to say, with one of the sockets Z vertically above one of the sockets or holes Z vhile the intermediate sockets or holes Z are arranged at one side of the others. Through a notch or hole i, formed in the chuck I of the dop, any one of the lower series of holes or sockets Z may be observed.

The adjustments of the present tool are for three positions, the same as in our previouslyreferred-to application; but the method of accomplishing the different adjustments is more or less different. When the table or eulet of the diamond is to be polished, the parts assume the vertically-adjusted position shown in Fig. 1; but when the facets are to be polished off the binding-nut J is loosened and the dop adjusted along the arc-shaped guidepiece II to the desired angle of inclination of the facet, such angle of inclination being determined by means of graduations shown on the side of the arcshaped guide-piece in Fig.1. The adjustment indicated by the inclined and dotted line in Fig. 1 is for a facet which is to be polished off at an angle of forty-five degrees. It will be seen that by the above-described adjustment the dop moves on a fulcral point which is formed by the diamond itself and does not by reason of any adjustwvhen the parts are in proper relation.

ment,.as in our former invention, move about on the surface of the polishing-wheel.

For changing the position of the diamond so that the facets may be properly polished off, according to the number thereof, the settin g-wheel L is utilized as in our previous invention and is used in the same way-that is to say, the set-screw m is set into one or the other of the upper series or intermediate se ries of sockets or holes in the surface of the setting-wheel according to the position of the facet. When the intermediate sockets or holes Z are to be used, the set-screw m is removed from the position shown in Fig. 8 and the same screwed into the screw-threaded opening m For changing the position of the grain of the diamond with relation to the direction of movement of the, po1ishing-wheel the hinding-screw N is loosened, so that the table D may be rotated.

It will be seen that, while the three adj ustments of the diamond are substantially the same as in our previous invention, the means of accomplishing the same are more simple, and hence the accuracy with which the diamond can be adjusted is more certain, as the adjustments are all attained without moving the diamond from the point of intersection of the lines which correspond to the different angles of inclination. A

The automatic stop and lifting mechanism (fully shown in Figs. 5 and 6) is contained in a casing P, which is fastened to the inner edge of the work-table adjacent to the polishingwheel. Fulcrumed at q to one end of a setting-lever Q, which is pivoted to the casing at q, is a locking-lever R, which at a point slightly in advance of the fulcrum q is formed with an upwardly-projecting nose 0', that is located under the arm of the polishing-tool A tooth r at the end of the long arm of lockinglever R takes into a peripheral notch s in a disk S, which is sleeved onto an arbor in the casing and carries by its sleeve 5' a pinion S,

the teeth of which mesh with the teeth of a large gear-wheel T, which in turn meshes with i a toothed segment T, pivoted in the casing at t. A lift U is guided in its vertical movement in the casing by means of a pin U, which extends from the easing into a longitudinal slot U therein, its lower end being connected by pivot U to the heel i of the segment T. A coiled spring V, similar to a clock-spring,

exerts a constant strain on the described train of mechanisms and causes the teeth of the locking-lever R to be held in the notch of the disk S.

For the purpose of adjusting the tip of the nose ofthe locking-lever to the point at which it is desired the arm or tongue of the polishing-tool should touch it, so as to stop the polishing action, the end of the long arm of the setting-lever Q is provided with a laterally pro ectingscrew-threaded pin 10, that extends IIO through a curved guide-slot 10, formed in one side of the casing P, and receives a thumbnut 102, that bears against that side of the casing and holds the nose in adjusted position.

From the above explanation it will be observed that as soon as the arm or tongue of the polishing-tool impinges upon the nose 0" the tooth r of the locking-lever is raised out of the notch of the disk S and the coiled spring V permitted to turn disk S, gear-wheel T, and toothed segment T, thus raising the lift U instantaneously against the under side of the arm of the polishing-tool and raising the dia- V mond or other stone being polished off of the polishing-wheel. Thedescribed train of mechanism is reset by means of a knob y, which projects from one side of the gear-wheel T through a curved slot 1 in one side of the casing.

Having thus described our invention, we claim as new and desireto secure by Letters Patent '1. In a diamond-polishing tool, the combination of an arc-shaped guide-piece, supporting means for the same, a laterally-movable dop extending radially from the curved-in side of the guide-piece, means for guiding the upper part of the dop in an arcuate path along the guide-piece, while its lower end forms the fulcral point of the dop and is approximately concentric with the guide-piece, and means for adjusting the dop on the guide-piece, substantially as set forth.

2. In a diamond-polishing tool, the combination of a vertically-movable post, means for supporting the same, devices for vertically.

adjusting the post in the supporting medium, an arc-shaped guide-piece fixed to the lower end of the post, a dop guided at its upper part in a circular path by said guide-piece, the lower end of the dop forming the fulcral point, and means for adjusting the dop on the guidepieee, substantially as set forth.

3. In a diamond-polishing tool, the combination of a rotary table, supporting means in which the table turns, a post fixed in said table against relative rotation, an arc-shaped guide-piece fixed to the lower end of the post,

a dop guided at its upper part in said guidepiece, and means for adjusting the dop on the guide-piece, substantially as set forth.

4. In a diamond-polishing tool, the combination of a bed-piece or base, a head-plate supported thereby and provided with a circular opening, a rotary table mounted to turn in said opening, a post fixed in said table against relative rotation, an arc-shaped guidepiece fixed to the lower end of the post, a dop guided at its upper part in said post and means for adjusting the dop on the guidepiece, substantially as set forth.

5. In a diamond-polishing tool, the combination of a rotary table, supporting means for the same, a post guided in an opening in the table, adjusting and setting screws for said post, an arc-shaped guide-piece fixed to the lower end of the post, a dop guided at its upper part in said guide-piece, and means for adjusting the dop on the latter, substantially as set forth.

0. The herein-described automatic stop and lifting mechanism for diamond polishing tools, consisting, in combination, of amovable nose or stop, a lift, and a train of mechanism between the stop and lift, whereby when the stop is depressed the lift is raised, substantially as set forth.

In testimony that we claim the foregoing as our invention we have signed our names in presence of two subscribing witnesses.

ERNEST LOESSER. RICHARD LOESSER. Witnesses H. WILLARD GRIFFITHs, GEO. L. WHEELooK. 

